Optocoupler is a passive optical component that can combine or split transmission data (optical power) from optical fibers. It is an electronic device which transfers electrical signals by using light waves. Linear optocouplers provide coupling with electrical isolation between its input and output when the electrical signals are transferred using light waves. Linear optocouplers consist of one LED optically coupled to two matched photodiode detectors.

Photodiode detectors are used for excellent linearity. The photodiode on the input side acts as a feedback device permitting an external feedback loop to ensure constant LED light output. A similar matching photodiode on the output side is used to drive an output circuit that is electrically isolated from the input. A fixed relationship is thus maintained between input and output. Linear optocouplers consist of an AlGaAs IRLED irradiating an isolated feedback as well as an output PIN photodiode in a bifurcated arrangement.

Need for high gain stability and low power consumption and increase in demand for industrial and high-reliability markets as well as applications are some of the primary factors driving the growth of the global linear optocouplers market.

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The feedback photodiode captures a percentage of the LED’s flux and generates a control signal which can be used to servo the LED drive current. Linear optocouplers couples AC as well as DC signals. It has high gain stability as well as low input-output capacitance.